For a given oriented spherical closed curve with n transversal double points, we assign a cyclic word of length 2n on two letters L standing left and R standing right by reading the crossing sign so that each crossing point is read once L and once R. The LR number of the curve is the number of appearance of subwords LR in the cyclic word. We completely determine oriented spherical closed curves whose LR numbers are less than or equal to three.
|ジャーナル||Tokyo Journal of Mathematics|
|出版ステータス||Published - 2015 12月 1|
ASJC Scopus subject areas
- 数学 (全般)